From mboxrd@z Thu Jan 1 00:00:00 1970 From: mark.rutland@arm.com (Mark Rutland) Date: Fri, 8 May 2015 12:36:42 +0100 Subject: [PATCH 10/12] drivers: psci: support native SMC{32,64} calls In-Reply-To: <1431085004-32743-1-git-send-email-mark.rutland@arm.com> References: <1431085004-32743-1-git-send-email-mark.rutland@arm.com> Message-ID: <1431085004-32743-11-git-send-email-mark.rutland@arm.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org A 32-bit OS cannot make calls with SMC64 IDs, while a 64-bit OS must invoke some PSCI functions with SMC64 IDs. This patch introduces and makes use of a new macro to choose the appropriate IDs based on the register width of the OS, which will allow 32-bit callers to use the PSCI client code. Signed-off-by: Mark Rutland Cc: Lorenzo Pieralisi --- drivers/firmware/psci.c | 25 +++++++++++++++++++------ 1 file changed, 19 insertions(+), 6 deletions(-) diff --git a/drivers/firmware/psci.c b/drivers/firmware/psci.c index 1eaa5d7..88e2249 100644 --- a/drivers/firmware/psci.c +++ b/drivers/firmware/psci.c @@ -27,6 +27,18 @@ #include /* + * While a 64-bit OS can make calls with SMC32 calling conventions, for some + * calls it is necessary to use SMC64 to pass or return 64-bit values. For such + * calls PSCI_0_2_FN_NATIVE(x) will choose the appropriate (native-width) + * function ID. + */ +#ifdef CONFIG_64BIT +#define PSCI_0_2_FN_NATIVE(name) PSCI_0_2_FN_##name +#else +#define PSCI_0_2_FN_NATIVE(name) PSCI_0_2_FN64_##name +#endif + +/* * The CPU any Trusted OS is resident on. The trusted OS may reject CPU_OFF * calls to its resident CPU, so we must avoid issuing those. We never migrate * a Trusted OS even if it claims to be capable of migration -- doing so will @@ -121,8 +133,8 @@ static int psci_migrate(unsigned long cpuid) static int psci_affinity_info(unsigned long target_affinity, unsigned long lowest_affinity_level) { - return invoke_psci_fn(PSCI_0_2_FN64_AFFINITY_INFO, target_affinity, - lowest_affinity_level, 0); + return invoke_psci_fn(PSCI_0_2_FN_NATIVE(AFFINITY_INFO), + target_affinity, lowest_affinity_level, 0); } static int psci_migrate_info_type(void) @@ -132,7 +144,8 @@ static int psci_migrate_info_type(void) static unsigned long psci_migrate_info_up_cpu(void) { - return invoke_psci_fn(PSCI_0_2_FN64_MIGRATE_INFO_UP_CPU, 0, 0, 0); + return invoke_psci_fn(PSCI_0_2_FN_NATIVE(MIGRATE_INFO_UP_CPU), + 0, 0, 0); } static int get_set_conduit_method(struct device_node *np) @@ -204,16 +217,16 @@ static void __init psci_init_migrate(void) static void __init psci_0_2_set_functions(void) { pr_info("Using standard PSCI v0.2 function IDs\n"); - psci_function_id[PSCI_FN_CPU_SUSPEND] = PSCI_0_2_FN64_CPU_SUSPEND; + psci_function_id[PSCI_FN_CPU_SUSPEND] = PSCI_0_2_FN_NATIVE(CPU_SUSPEND); psci_ops.cpu_suspend = psci_cpu_suspend; psci_function_id[PSCI_FN_CPU_OFF] = PSCI_0_2_FN_CPU_OFF; psci_ops.cpu_off = psci_cpu_off; - psci_function_id[PSCI_FN_CPU_ON] = PSCI_0_2_FN64_CPU_ON; + psci_function_id[PSCI_FN_CPU_ON] = PSCI_0_2_FN_NATIVE(CPU_ON); psci_ops.cpu_on = psci_cpu_on; - psci_function_id[PSCI_FN_MIGRATE] = PSCI_0_2_FN64_MIGRATE; + psci_function_id[PSCI_FN_MIGRATE] = PSCI_0_2_FN_NATIVE(MIGRATE); psci_ops.migrate = psci_migrate; psci_ops.affinity_info = psci_affinity_info; -- 1.9.1